The only truely "decentralised" system is the universe. You can not roll back anything, time passes and the laws of physics take care of executing themselves with no possible changes on the "blockchain". No coin that is decentralised in that sense can exist. Cryptocoins are simulations of a universe, but humans are one level on top of it, and the protocol can not reach out and prevent somebody from fiddling with the controls.
This is a good quote!
I'll try to remember to link to this when this issue inevitably comes up again.
Thank you! Feel free to "steal" it instead and repeat it to your satisfaction! The only desired outcome is for more people to think about the blockchain and realise what it is and isn't. I feel like every day I realise something new about it and my mind is blown even more. Regardless, I think this is a great thread and many new and interesting perspectives were opened for me. Definitely something to file in the "stuff everybody interested in crypto should read through" pile.